metatungstic

from The Century Dictionary.

• Noting a metallic acid, forming small yellow crystals of the composition H₂W₄O₁₃.7H₂O, obtained by decomposing barium metatungstate by dilute sulphuric acid. It differs from ordinary or normal tungstic acid in being soluble in water.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Of, pertaining to, or designating, an acid known only in its salts (the metatungstates) and properly called polytungstic, or pyrotungstic, acid.